ZCARD

Synopsis

ZCARD key

This command returns the number of members in the sorted set at key. If key does not exist, 0 is returned.

• If key is associated with non sorted-set data, an error is returned.

Return value

The cardinality of the sorted set.

Examples

You can do this as shown below.

$ ZADD z_key 1.0 v1 2.0 v2

(integer) 2

$ ZADD z_key 3.0 v2

(integer) 0

$ ZCARD z_key

(integer) 2

$ ZCARD ts_key

(integer) 0

See also

zadd, zrange, zrangebyscore, zrem, zrevrange